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I asked a question on the forums ( http://forums.rockbox.org/index.php/topic,51692.new.html#new ) and the person who replied to my post told me to come here to ask if what I want to do is feasable. Could someone answer that for me?

not really. What happens in almost cases (even jz lcd interface) is that you implement the transport layer (jz lcd, spi), then you disassemble the firmware to find the (usually long) init sequence, and commands to redraw, and they you are rolling

it might change the size of the pcm samples but data will most likely still be sent over i2s. And even then, codec usually let you choose the pcm size. So we will most likely still send 16-bit pcm samples